Portable heavy metal detector and detection method thereof

Abstract

The invention discloses a portable heavy metal detector and a detection method thereof. The portable heavy metal detector comprises a main engine and an analyzer accessory, wherein the analyzer accessory comprises an electrode plug fixed seat, an electrode mounting plug, a hoisting rod, an analyzing tank, a rotary barrel and a base; the hoisting rod is arranged at the right side part of the upper end of the base; the rotary barrel is arranged at the left side part of the upper end of the base; the analyzing tank is arranged in the rotary barrel; the electrode plug fixed seat is hinged to the upper end of the hoisting rod; the electrode mounting plug is arranged at the lower left part of the electrode plug fixed seat; the main engine comprises an instrument shell; a dialing switch and an external interface are arranged at the rear side edge of the upper part of the instrument shell respectively. The portable heavy metal detector disclosed by the invention has the beneficial effects that detection time is short: a detection result can be given within 5min and detection time of single heavy metal is less than 30 seconds; the sensitivity is high: a detection range is 1ppb to 10ppm, the linear range is wide; an electrode has a unique advantage: a plugging type disposable silk-screen printing electrode is adopted so that the portable heavy metal detector has stable performances, is convenient to operate, adopts a portable and humanized design and liquid crystal display of a high-definition screen is adopted.

Description

technical field [0001] The invention relates to the field of heavy metal analysis, in particular to a portable heavy metal detector and a detection method thereof. Background technique [0002] At present, heavy metal pollution is one of the main factors affecting the safety of agricultural products in my country, and it has the characteristics of multiple sources, strong concealment, small migration, high toxicity, complex chemical behavior and ecological effects, etc. The detection process is complicated, the steps are cumbersome, and the efficiency is low. The cost is high, and it is easy to cause secondary pollution to the environment. Traditional detection methods are atomic absorption spectrometry, atomic emission spectrometry or inductively coupled plasma mass spectrometry. Reasons make it difficult for this technology to be widely used, let alone achieve the purpose of on-site detection. Most of the existing electrochemical heavy metal detectors on the market use an...

AI Technical Summary

Problems solved by technology

However, the instruments all use a three-electrode system, in which the working electrode is a mercury-based electrode. Since the mercury-based electrode cannot be maintained in situ and will cause secondary pollution of mercury, this has become a technical bottleneck for rapid and simple detection of heavy metals.

[0003] Portable heavy metal ion detectors based on X-ray fluorescence spectroscopy have been developed at home and abroad, which have the advantages of fast analysis speed, X-ray fluorescence spectroscopy has nothing to do with the chemical combination state of the sample, non-destructive analysis, simple sample preparation, and high precision. There are still the following shortcomings that are difficult to overcome: a) it is difficult to do absolute analysis, and quantitative analysis requires a large number of standard samples; b) it is easily affected by interference from other elements and superimposed peaks

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